Play Archfiend of the Dross, then use Metamorphic Alteration on one of your opponent's creatures, and hey presto: they lose the game next turn
Secondly, Counterbalance isnt at its best, as their deck expands upon the one-mana and two-mana spells territory which makes Counterbalance less reliable, followed by the fact that they are also running Abrupt Decay which might be accompanied by Golgari Charm post-board
Arabian Nights is actually quite good at this
By paying two generic mana and one blue, you can have it enter the battlefield with just the Mirror Room door unlocked , and so, when it enters, you can make a Reflection token copy of any target creature you control
For example: Reduced Investment Risk: Knowing that Foundations cards will be legal for a longer period allows new players to invest in the products and their decks without worrying about the cards becoming obsolete too quickly
It was sacrificed nearly 100% of the times it was put into play